Imagine, with the help of the new Havok Behaviour Engine, that beast races in Skyrim looked and acted genuinely different from all the other races. They could walk and move in a far more realistic and animalistic manner, and could really use the environment to their advantage. Khajiit's could climb, leap and claw their way around the landscape and could perhaps have totally unique abilities not available through other means, such as enhanced night vision (which would be better than anything you could get through items or spells) which would highlight weapons, treasure, or other useful items in their immediate surroundings, as well an advanced "threat sense" for locating hostiles. Argonians could have increased resiliance and could move at greater speeds, especially when in water. Their strength and effectiveness in combat could be further enhanced by a unique "bullet-time" ability as well as perhaps some kind of venom attack or even a lethal swipe of their tails.